IUGN66-1-52-20.0 is a single-pole hydraulic magnetic circuit protector from the IAG/IUG/IEG/CEG/LEG series designed for low-cost power switching and accurate circuit control in international equipment applications. This unit features a delay curve 52 characteristic, which provides long delay times suitable for starting certain types of motors and protecting transformer and capacitor loads, with trip times ranging from 2 to 60 seconds at 125% rated current down to 0.006 to 0.1 seconds at 1000% rated current. The protector operates with a DC resistance of 0.006 ohms and AC impedance of 0.006 ohms at 50/60 Hz, ensuring minimal voltage drop during normal operation. The single-pole configuration includes standard mounting details with 2X 6-32 thread holes (3.56 mm deep) and optional M3 ISO threads, with overall dimensions of approximately 2.075 inches (52.71 mm) width and 1.897 inches (42.85 mm) height. This circuit protector is ideal for equipment requiring IEC compliance and provides reliable overload protection for sensitive electronic equipment and industrial control systems.